This is a good suggestion in order for a created family to have a solid foundation of financial sources and not to experience famine.
Not entirely true, there are rich family where kids are rebelious and is engaged in different illegal stuff. While there are poor family but the respect and love of children to their parents are solid. This is because it is the time spent by parents to their kids that is essential in molding the childrens characters.
Again not entirely true. There are lots of good provider husbands that were betrayed by their wife. There are lots of cases like this being reported in one of the programs that is aired or streamed on YT. While there are poor husbands that have a faithful wife. I think this kind of thing depends on the personality of a person.
In conclusion, I agree that a person should be financially capable before getting into marriage so that they won't have trouble in financing the growth of the family and the needs of their offspring.